(Alan Turing wasn't a philosopher but a mathematician; nevertheless, his 1950 paper "Computing Machinery and
Intelligence" has had a great impact on the philosophy of mind, though is often misunderstood.)

"This digital archive contains mainly unpublished personal papers and photographs of Alan Turing from 1923-1972.
The originals are in the Turing archive in King's College Cambridge. [...] The images in this archive are copyrighted. You must
read and agree to the terms of use before you can view the contents of the archive."

It's chief purpose is "to foster the spirit of the Enlightenment, tolerance and respect for the rights of the
individual as exemplified by the life of Voltaire and as reflected in the beliefs of his contemporaries, the founders of the United
States."